they're being used -- they are the stuff of science fiction but a key weapon overseas in the hunt for terrorists. now they are coming here. >> president obama signed a bill that opens u.s. air space to thousands of these unmanned aircraft. jeff glor has been looking into it for us and he joins us for more. good morning. >> good morning. drones are where personal computers were in the early '80s. about to be part of our everyday lives. the question is, are we ready? >> reporter: they come in just about any size you want. as large as a passenger plane, as small as a hummingbird. unmanned aerial vehicles, as most people know them, drones. >> there's no stopping this technology. anyone who thinks they can put this genie back in the box, that's silliness. >> reporter: peter singer, a military expert and perhaps the country's foremost authority on drones has watched them dramatically alter the american battlefield overseas. and he says they're about to become the next big thing at home. >> their technologies not only give you capabilities you couldn't have imagined a generation earlier, but